编写一个JAVA程序，描写一个矩形类，并输出某个矩形的长，宽，面积。具体描述如下？

// 矩形

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public class RectangleDemo {

public static void main(String[] args) {

RectangleDemo demo = new RectangleDemo(12, 32);

System.out.println(demo.getPerimeter());

System.out.println(demo.getArea());

demo = new RectangleDemo();

System.out.println(demo.getArea());

System.out.println(demo.getPerimeter());

demo.setHeight(50);

demo.setWidth(30);

System.out.println(demo.getArea());

System.out.println(demo.getPerimeter());

}

// 求周

public double getPerimeter() {

return (height + width) * 2;

}

// 求面积

public double getArea() {

return height * width;

}

public RectangleDemo(double height, double width) {

this.height = height;

this.width = width;

}

public RectangleDemo() {

this.height = 10;

this.width = 10;

}

private double height;// 高度

private double width;// 宽度

public double getHeight() {

return height;

}

public void setHeight(double height) {

this.height = height;

}

public double getWidth() {

return width;

}

public void setWidth(double width) {

this.width = width;

}

}

编写矩形类RectangleJava程序矩形类两数据员别rLength宽rWidth通getLength()、getWidth()、getArea()别查看矩形、宽面积通setLength()setWidth()重新设置矩形宽

Java 编写一个矩形类Rect

public class Rect {

private double length;//矩形的长

private double width;//矩形的宽

public Rect() {}//默认构造器

public Rect(double length,double width) {

this.length = length;

this.width = width;

}

/**

* 取得矩形的面积

* */

public double getArea(){

return this.getLength() * this.getWidth();

}

/**

* 取得矩形的周长

* */

public double getPerimeter(){

return (this.getLength() + this.getWidth()) * 2;

}

/**

* 取得矩形的面积，需传入矩形长与宽

* */

public double getArea(double length,double width){

return length * width;

}

/**

* 取得矩形的周长，需传入矩形长与宽

* */

public double getPerimeter(double length,double width){

return (length + width) * 2;

}

public double getLength() {

return length;

}

public void setLength(double length) {

this.length = length;

}

public double getWidth() {

return width;

}

public void setWidth(double width) {

this.width = width;

}

}

Java编写一个矩形类，并计算面积和周长？

class Rectangle{

private int width = 2;

private int length = 1;

public int getWidth(){

return this.width;

}

public void setWidth(int w){

this.width = w;

}

public int getLength(){

return this.length;

}

public void setLength(int l){

this.length = l;

}

public int getArea(){

return this.length * this.width;

}

public int getCircumference(){

return (this.length + this.width) * 2;

}

public Rectangle(){}

public Rectangle(int l, int w){

this.length = l;

this.width = w;

}

}

public class demo{

public static void main(String[] args) {

Rectangle rect = new Rectangle(30, 8);

System.out.print("长方形的面积是：");

System.out.println(rect.getArea());

System.out.printf("长方形的周长是：%d\n", rect.getCircumference());

}

}

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